[rochler]

if you want to use it primarily for night sky viewing then a 6" to 8" Dob. as suggested by Ving would be exceptionally good value for money (great choice). However, as Davidpretorius correctly points out - being a reflector it would give you an upside down image when used for terrestrial viewing.

But you could overcome that problem with a 45 deg. diagonal mirror in front of the eyepiece? With a refractor you wouldn't have the upside-down image problem, but you get a lot less aperture for the $$$.

I guess you'd have to run the options past your neighbour & he/she can decide based on the most likely usage & preference.

Both types would be very easy to use, transport & setup.

Cheers, Fred...